通风管道变形的关键原因有四个：
There are four key reasons for the deformation of ventilation ducts:
1.在自然养护标准下，镁混凝土体积为连续膨胀过程，线膨胀率为0.1-0.2%，体积含水率为1%左右。
Under natural curing standards, the volume of magnesium concrete undergoes a continuous expansion process, with a linear expansion rate of 0.1-0.2% and a volume moisture content of about 1%.
2.燃烧过程中很难避开磁铁矿，安装在3C认证防火阀中的粗晶MgO水化过程缓慢。已产生抗压强度的粉煤灰水泥中的MgO再次遇水并水化时，转化为Mg(OH)2，体积增加120%。
2. It is difficult to avoid magnetite during the combustion process, and the hydration process of coarse-grained MgO installed in 3C certified fire dampers is slow. When MgO in fly ash cement that has developed compressive strength encounters water again and hydrates, it is converted into Mg (OH) 2, resulting in a volume increase of 120%.
3.水合后轻烧氧化镁中分散CaO的体积增加90%，而卤素片中存在SO42-。当Ca(OH)2转化为成熟石膏时，固态体积会增加2倍以上，导致产物变形，这也是限制轻烧氧化镁中分散CaO和卤素片中SO42-含量的原因。
3. After hydration, the volume of dispersed CaO in lightly burned magnesium oxide increases by 90%, while SO42- is present in halogen flakes. When Ca (OH) 2 is converted into mature gypsum, the solid volume will increase by more than twice, leading to product deformation, which is also the reason for limiting the content of dispersed CaO and SO42- in halogen flakes in light burned magnesium oxide.
通风管道
Ventilation ducts
4.MgO-Mg-C12-H2O体系软件的水化过程是一个明显的化学反应过程，制造的管道体积较大。如果工作温度高，反映的是升温过程，板材本身过高，反映不够，导致晶体地应力和热变形地应力大，使产品体积膨胀。
The hydration process of MgO-Mg-C12-H2O system software is an obvious chemical reaction process, and the manufactured pipeline volume is relatively large. If the working temperature is high, it reflects the heating process. If the plate itself is too high, it will not reflect enough, resulting in high crystal stress and thermal deformation stress, causing product volume expansion.
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